Intaglio-printing machine for printing sheets on both sides



Feb. 26, 1929. 1,703,699

o. WlI -HELM INTAGLIO PRINTING MACHINE FOR PRINTING SHEETS ON BOTH SIDES Filed Oct. 5, 1927 $277314 AYMIZM Patented Feb. 26, 1929.

UNITED STATES PATENT OFFICE.

mm WILHELM, or AUGsiiURG, GERMANY, 'nssronon To run mm mascnmnnrnmx AUGSBURG-NUERNBERG, .axrxnnensnnrscnarr, or nucsnuae, ens.-

HANY, A CORPORATION OF GERMANY.

INTAGIiIO-PBINTING MACHINE FOR PBIN TING SHEETS ON BOTH SIDES.

Application filed October 5, 1927, Serial 110,224,033, and in Germany October 18, 1926.

I, My invention relates to intaglio printing printing machines arranged for perfecting' if in which the sheet is directly transferred by the grippers of the first impression cylinder to receive the second impression are old. These arrangements are however, not suitable for intaglio printing as they do not provide for drying the sheets. Drying is essentialin connection with intaglio printing machines as otherwise the first impression made on the upper side of the sheet is smeared over during the production of the second impression on the back of the sheet. There are also in use intaglio printing machines for printing on sheets in which the sheet is transferred by the grippers of the first impression cylinder to the grippers of a drying drum and is then transferred by means of a transfer cylinder to the ippers of the second impression cylinder. S uch an arrangement has the disadvantage that the sheet lies upon the drying drum with the printed side inside, which is unfavourable to proper drying. Moreover, the sheet must be transferred from the drying cylinder through an additional transfer cylinder.

According to the present invention which has for its object to avoid the above 'mentioned drawbacks, the sheet is transferred by the grippers of the first impression cylinder immediately after the printing to the grippers of the second impression cylinder, the latter transferring the sheet to the grippers of a drying drum. The grippers of the drying drum then return the sheet to a set of grippers arranged upon the second half of the second impression cylinder, whereupon the sheet is provided with a second impression. This improved arrangement has the advantage that the sheet lies with the printed side outside upon the drying cylinder, which is favourable for proper drying, as the fresh impression may be exposed'to a current of drying air so that the moist particles of colour will rapidly evaporate owing to contact with the air. Moreover there is no need of providing in this arrangement for 50 a separate transfer cylinder, and the machine is, therefore, of very simple and compact construction and easy to operate.

On the drawing being a diagrammatic illustration- F 1g. 1 shows one construction embodying the invention suitable for perfecting in one colour.

Fig. shows an arrangement suitable for perfect ng in two or more colours.

According to Fig. 1, a sheet is taken from the feed table by the grippers a of a first impression cylinder 6 and is printed upon the upper side by the first form cylinder 0. The sheet is then transferred to grippers (Z of the second impression cylinder 6 the grippers es first transferrin the sheet'to a heated drying drum f w ich is alsb provided with gr ppers g. The fresh impression lies upon th s drying drum with the outside. The grippers 9 then re-transfer the sheet to a second set of grippers h of the second impresslon cylinder 6, the sheet is given a second impression by the second form cylinder 2', and is then transferred to the drying and delivery cyllnders k and Z, which delive'r the sheet to the delivery tapes m, to be stacked as shown at 17.

Fig. 2 shows a similar arrangement for a perfecting machine printing in two colours.

Perfecting in one colour is first carried out 30 in the same manner as described in connection with the construction shown in Fig.

1, by means of the printing sets 6, c and e, z. The delivery cylinder Z does not however, transfer the sheet to delivery tapes, but 35 transfers it to grippers n of the first impression cylinder 0 of a second perfecting printing set which is arranged vertically below the first printing set and produces upon the sheet a second upper and lower impression. By the second printing set the sheet is delivered to delivery tapes m and is piled upon the stack p.

What I claim is:

1. In a perfecting intaglio printing machine, the combination with an impression cylinder. a cooperating form cylinder and a second impression cylinder and a' cooperating form cylinder, of a drying cylinder disposed adjacent to said second impression cylinder and above its cooperating form cylinder, a set of grippers on said second impression cylinder adapted to transfer the sheet after the first impression to said drying cylinder with the printed side on the outside, and a second set of grippers on said second impression cylinder adapted to receive the sheet from said drying cyl inder so as to cause its second impresslon.

- 2. In a perfecting intaglio printing ma-' chine, the combination with an impression cylinder, a cooperating form-cylinder and a second impression cylinder and a cooperating form cylinder, of a drying cylinder disposed adjacent to said second impression cylinder and above its cooperating form cylinder, a set of grippers on said second impression cylinder adapted to transfer the sheet after the first impression to said drying c linder with the printed side on the outsi e, and a second set of grippers on said second impression cylinder adapted to receive the sheet from said drying cylinder so as to cause its second impression, and

- delivery cylinders for delivering the printed sheets to be stacked.

3. In a perfecting intaglio printing machine, the combination with an impression cylinder, a cooperating form cylinder and a second impression cylinder and a cooperating form cylinder, of a. drying cylinder-disposed adjacent to said second impression posed drying cylinder, the cylinders of said second set being arranged perpendicularly below the corresponding cylinders of said first set of cooperating impression and form cylinders.

4. The combination as specified in claim 3, including delivery cylinders cooperating with each of said sets for delivering the permitted sheets to be stacked.

In testimony whereof. I have afiixed my signature.

OTTMAR WILHELM. 

